I had one of these once, so from memory...
Remove magazine.
Eject any rounds in the gun.
Sight through the barrel to confirm the gun is empty.
Locate a small mark/notch on the SLIDE and on the gun frame. I remember these as being on the left side of the gun.
If you don't find a notch on both SLIDE and frame, try to align to the finger grips on the side of the SLIDE.
Push SLIDE back until aligned and lift up on the rear of the SLIDE. Be very careful at this point or the spring and/or firing pin will likely shoot across the room an get lost if you lift the SLIDE too high. Instead release the spring pressure by moving the SLIDE toward the rear of the gun.
In case you're wondering...I remember it was easier to put together than come apart. I believe you simply lay the firing pin/spring assembly into position on the gun frame, then set the SLIDE on top; push forward toward the front of the gun while slightly pushing down on the rear of the SLIDE. Essentially, the reverse of taking it apart but nothing to line up.
You need a gunsmith.
Take it to a gunsmith and ask for help
You need a gunsmith
Take it to a gunsmith and ask for help
Best to have a gunsmith teach you how.
If you don't have a manual, find a gunsmith and ask for help
Ask a gunsmith for help
You need a gunsmith.
Best left to a gunsmith
Go to:http://stevespages.com/page7b.htm click on: Colt MKIV Series 80 380 Hope that helps.
Take it to a gunsmith and ask for help
Take it to a gunsmith and ask for help